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Re: Extending RDFS, property-classes

From: Richard Cyganiak <richard@cyganiak.de>
Date: Tue, 10 Feb 2009 00:10:15 +0000
Cc: Jiri Prochazka <ojirio@gmail.com>, semantic-web@w3.org
Message-Id: <18601678-0FD3-434E-9DCE-5831E3F523C2@cyganiak.de>
To: Richard Newman <rnewman@twinql.com>


On 9 Feb 2009, at 23:14, Richard Newman wrote:
> Your proposed ontology, IMO, has somewhat limited utility. It does  
> allow generalization of an inference rule to generate both sets of  
> annotations from one or the other, but that doesn't solve the  
> fundamental missing abstraction. It would seem somewhat ridiculous  
> to me to have every ontology include both reified and direct  
> forms... for what end? Surely the reified form does everything the  
> direct form does?

Perhaps not every vocabulary needs both reified and direct forms for  
everything. Vocabularies are typically designed at a certain  
“granularity”, and if one vocabulary doesn't provide the level of  
detail that your application needs, then you will have to use another  
one.

I see Jiri's proposal as a potential technique for mapping between  
those “high-detail” and “low-detail” vocabularies. At the moment, we'd  
have to use rules for that, because neither RDFS nor OWL can express  
that sort of mapping.

Best,
Richard


>
>
> OWL 2 cuts this knot by allowing direct annotations of assertions,  
> but I don't know a single customer who's thinking about using it (a  
> chicken/egg problem). (For that matter, I don't know of any  
> widespread deployments of OWL 1; the most common situation in my  
> experience is RDFS + simple reasoning.)
>
> -R
>
>
> On  9 Feb 2009, at 12:54 PM, Jiri Prochazka wrote:
>
>> This is a good thing, but unfortunately there is no link between the
>> properties and the class, which makes the data tagged with the
>> properties and the data tagged with the class, like they each used
>> different non-interlinked vocabularies...
>
>
Received on Tuesday, 10 February 2009 00:10:56 UTC

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